Home Crop Monitoring Corn School: How much rain does corn need?

Corn School: How much rain does corn need?


Climate is the last word supply for small discuss, and rainfall is maybe probably the most talked about — from how much, to when, to not sufficient, and on too much.

For this episode of the Corn Faculty, Bernard Tobin asks Dale Cowan, senior agronomist at AGRIS C0-operative, about how much rain a corn crop wants all through the season and in regards to the important occasions throughout a crop’s development that it wants that rain. Plus, as soon as we’ve got that data, how will we handle our soils and crops to ensure we’ve got moisture all through the season?

“At this growth stage (six to seven leaf), roughly it’s been at least four inches of rain, maybe even closer to five,” says Cowan. “That’s a combination of not just rain but also stored soil moisture as well.”

A excessive yielding corn crop might devour roughly 25 inches of moisture per acre, per 12 months, says Cowan, which is a considerable quantity. By the tassel stage, the plant may have consumed about 10 inches of water, and the remaining 15 inches shall be wanted through the reproductive stage.

“It always amazes me that even at dent, just prior to black-layer, we’re still looking at 0.18 to 0.2 inches of water per acre per day, even though we’re almost finished the crop at that time, so water use goes right up to black-layer,” says Cowan.

For optimum yield, a corn crop wants fairly regular moisture all through germination and emergence and  into the vegetative stage, however probably the most important level for the crop to get moisture is at tasselling or silking stage — nearly 10 inches of water is required between the R1 and R5 development phases (Story continues under video)

Digging a bit deeper into administration methods for retaining soil moisture, Cowan says which means beginning to have a look at extra advanced rotations, together with cowl crops, much less tillage, extra residue left on the soil floor which reduces the evaporation price and will increase water infiltration charges, and provides extra natural matter to the soil — each one per cent of natural matter, holds one inch of water, says Cowan.

“Those are the things you start to see make a difference, especially when it’s dry  or somewhere where we have a moisture deficit,” says Cowan.

If leaf-roll happens earlier than the reproductive stage, so long as it doesn’t exceed 12 hours per day, Cowan says it received’t have a huge effect on yield.

“I think that yield loss is very much dependent on what’s causing the leaf rolling,” says Cowan. Soil administration, fertility, and moisture all get layered and may make that little little bit of distinction all through the rising season.


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